How to plot Histogram with lines?

[Assalmi]

Hi, I tried to plot this .txt file (test.txt (661 Bytes)
) by this code in the root, I would like to connect the points by line, is possible in the root?

#include "Riostream.h"
void rt()
{
   TString dir = gSystem->UnixPathName(__FILE__);
   dir.ReplaceAll("rt.C","");
   dir.ReplaceAll("/./","/");
   ifstream in;
   in.open(Form("%stest.txt",dir.Data()));
   Float_t x,y;
   Int_t nlines = 0;
TFile *f = new TFile("17wac.root","RECREATE");
   TCanvas *c1 = new TCanvas("c1","c1",600,400);
   TH1F *he = new TH1F("he"," with Histogram ",100000,-50,50);
   while (1) {
      in >> x >> y;
      if (!in.good()) break;
      if (nlines < 800000) printf("x=%8f, y=%8f\n",x,y);
 nlines++;     
 he->Fill(x,y);     
   }
   gStyle->SetEndErrorSize(3);
   gStyle->SetErrorX(1.);
   he->SetMarkerStyle(20);
he->SetMarkerStyle(2);
he->SetMarkerColor(kBlue);
  he->Draw("L");
f->Write();
   return c1;
}

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ROOT Version: Not Provided
Platform: Not Provided
Compiler: Not Provided

---

[couet]

he->Draw("HIST L");

[Assalmi]

thanks for your answer, i tried with he-> Draw (“HIST L”);
he gives me this:

but I would like to be like this:

[couet]

try

he->Draw("HIST");

But that will not help I guess. It seems you have many empty bins.

[Assalmi]

Nothing changed with he->Draw("HIST");

[couet]

Yes that what I said. Your histogram mainly consists of empty bins.

TH1F *he = new TH1F("he"," with Histogram ",100000,-50,50);
                                            ^^^^^^^

In this case each bin is 100 smaller than a pixel.